If $\cos \theta + \cos 7\theta + \cos 3\theta + \cos 5\theta = 0$, then $\theta $
If $\cos \theta + \cos 7\theta + \cos 3\theta + \cos 5\theta = 0$, then $\theta $
- A
$\frac{{n\pi }}{4}$
- B
$\frac{{n\pi }}{2}$
- C
$\frac{{n\pi }}{8}$
- D
None of these
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